Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005noao.prop..441m&link_type=abstract
NOAO Proposal ID #2005B-0441
Astronomy and Astrophysics
Astronomy
Scientific paper
This proposal is part of a project to establish comprehensive and reliable membership information for four rich, old open clusters (NGC 2506, NGC 2682, NGC 6791, and NGC 7789) using accurate space motions. For each cluster we will provide highly reliable three-dimensional kinematic membership determinations for the entire evolved cluster population; excellent two-dimensional kinematic membership determinations for cluster members to masses as low as 0.5 M_&sun;; and a complete census of the short-period binary population among the solar-type stars, with orbital solutions for periods up to 10^3 days. As one scientific outcome, our radial-velocity surveys will lay the foundation for studies of the dynamical evolution of cluster binary populations and for an exploration of the interplay between stellar evolution and stellar dynamics, as traced by ?anomalous? stars that cannot be explained by single-star evolutionary theory. This is a program integrating the Mayall 4-m for astrometric imaging with the WIYN 3.5m/Multi-Object Spectrograph and the MMT/Hectochelle for high- precision radial-velocities. Here we request time with MMT/Hectochelle to obtain radial velocities of faint stars in the crowded cores of the more distant clusters in our sample, NGC 2506, NGC 6791, and NGC 7789.
Geller Aaron
Latham David W.
Mathieu Robert D.
Platais Imants
Szentgyorgyi Andrew H.
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